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Doctoral Thesis
DOI
10.11606/T.10.2008.tde-16072008-151833
Document
Author
Full name
Luciane Tieko Shinya Zucon
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
Moreno, Andrea Micke (President)
Balian, Simone de Carvalho
Calderaro, Franco Ferraro
Knöbl, Terezinha
Moretti, Anibal de Sant´Anna
Title in Portuguese
Caracterização fenotípica e genotípica de amostras de Salmonella spp. isoladas de suínos
Keywords in Portuguese
Salmonella spp
AFLP
PFGE
Salmonelose suína
Sorotipagem
Abstract in Portuguese
Entre os microrganismos relevantes para a segurança alimentar, bactérias do gênero Salmonella tem se destacado como causadoras de toxinfecções, sendo motivo de preocupação constante para a cadeia de produção de aves e suínos. Os objetivos deste trabalho foram estudar a ocorrência de Salmonella spp. em suínos sadios ao abate e em animais apresentando sinais clínicos de salmonelose, tipificação dos isolados através da sorotipagem, polimorfismo do comprimento de fragmentos amplificados (AFLP) e eletroforese em gel de campo pulsado (PFGE). Foram examinados 50 animais com sintomatologia sugestiva de salmonelose de 12 granjas dos Estados de São Paulo, Paraná e Rio Grande do Sul e analisadas amostras de fezes, linfonodos e suabes de carcaças de 124 animais de quatro frigoríficos do Estado de São Paulo. Dos suínos com sintomatologia clínica, 38% dos animais foram positivos para o isolamento de Salmonella spp., sendo selecionadas 45 cepas, classificadas como S.Typhimurium (29/45), S. Choleraesuis (9/45), S. Infantis (3/45) e S. enterica subsp. enterica (4/45). Dos 124 suínos sadios, 16,12% foram positivos para o agente, sendo isoladas 39 cepas que foram classificadas como S. London (11/39), S. Anatum (11/39), S. Typhimurium (8/39), S. Agona (2/39), S. Enteritidis (2/39) e S. enterica subsp. enterica (5/39). Através do AFLP, a caracterização genética dos isolados revelou índice discriminatório igual a 0,85 e gerou 12 perfis distintos. O índice discriminatório do PFGE foi 0,96 apresentando 31 padrões distintos. Ambas as técnicas possibilitaram uma boa correlação entre isolados, seus sorotipos e locais de isolamento, sugerindo grande potencial para sua aplicação na genotipagem de Salmonella spp.
Title in English
Phenotypic and genotypic characterization of Salmonella spp. strains isolated from pigs
Keywords in English
Salmonella spp
AFLP
PFGE
Salmonelosis
Serotyping
Abstract in English
Among relevant microorganisms to food security, Salmonella has been highlighted as a major cause of food borne diseases, being a constant concern for poultry and pig production chain. The goal of this study was to investigate the Salmonella spp incidence in healthy pigs at slaughter, as well as in pigs showing salmonellosis clinical signs, characterize strains by serotyping, Amplified fragment length polymorphism (AFLP) and Pulsed field gel electrophoresis (PFGE). Fifty animals, presenting salmonelosis suggestive clinical symptoms, from 12 swine herds from Sao Paulo, Parana and Rio Grande do Sul states were examined and clinical materials such as stool samples, lymph nodes and carcass swab from 124 animals from four Slaughterhouses in Sao Paulo state were analyzed. Among the pigs with clinical symptoms, 38% of the animals were positive for the Salmonella spp. isolation. Forty five strains were selected and classified as S.Typhimurium (29/45), S. Choleraesuis (9/45), S. Infantis (3/45) and S. enterica subsp. enterica (4/45). From the 124 healthy pigs studied, 16.12% were positive for the agent. Thirty nine strains were isolated and classified, by serotyping, as S. London (11/39), S. Anatum (11/39), S. Typhimurium (8/39), S. Agona (2/39), S. Enteritidis (2/39) and S. enterica subsp. enterica (5/39). Through AFLP, genetic characterization of isolates showed discriminatory index of 0.85 and generated 12 distinct profiles. The PFGE discriminatory index was 0.96, showing 31 distinct patterns. Both techniques allowed a good correlation between the isolates, its serotypes and isolation locations, suggesting great potential of its application in genotyping of Salmonella spp.
 
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Publishing Date
2008-08-29
 
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